Like some of those stage-door Johnnies? (4)

I believe the answer is:

aged

I'm a little stuck... Click here to teach me more about this clue!

'like' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

'some of those stage-door johnnies?' is the wordplay.
'AGED' is hidden within the letters.
But, I am not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for aged that I've seen before include "not a modern copy" , "Senior" , "Ripened, matured" , "Like Uncle Arly" , "Very old, person or wine" .)

I've seen this clue in the Evening Standard.

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